Determine the absolute maximum shear stress in the shaft of Prob. 5€“88.

Prob. 5-88: A rod is made from two segments: AB is steel and BC is brass. It is fixed at its ends and subjected to a torque of T = 680 N ˆ™ m. If the steel portion has a diameter of 30 mm, determine the required diameter of the brass portion so the reactions at the walls will be the same. G_st = 75 GPa, G_br = 39 GPa.

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1.60 m 680 N-m A 0.75 m 1.60 m 680 N-m 0.75 m